With Windows 2000/XP/2003, you can use the netsh command to script the process of changing a computer TCP/IP setting withoutrebooting the computer.
Using the netsh command to prevent traffic from being passed by the network adapter
You can use netsh command to prevent traffic from being passed by the network adapter. To do that, you can use the Netsh to re-set a different IP address or default gateway , for example, netshell interface ip set address interface_name static ip_address subnet_mask default_gateway metric.